nomad-pack_version

#!/usr/bin/env bash

DEST="/usr/local/bin"
SRC="/opt/nomad-pack/bin"
APP="nomad-pack"

SCRIPT=`basename ${BASH_SOURCE[0]}`

### # functions
function usage () {
  local l_MSG=$1
  echo "Usage Error: $l_MSG"
  echo "Usage: ${SCRIPT}"
  echo ""
  echo "Recognized optional command line arguments"
  echo "-v <string>  -- specifies the target version.  Defaults to latest stable version."
  echo "-i -- Use interactive mode"
  echo "-d -- Delete rather than switching to a version"
  echo "-h -- show this help"
  exit 1
}

function yaydone {
  ls -al ${DEST}/${APP}
  ${DEST}/${APP} version
  exit 0
}

function switchversion {
  local l_VERSION=$1
  if [[ -L ${DEST}/${APP} ]]
  then
    echo -n "Removing existing and "
    rm -f ${DEST}/${APP}
  fi
  echo "Creating symlink for version ${l_VERSION}"
  ln -s ${SRC}/${APP}-${l_VERSION} ${DEST}/${APP}
  yaydone
}

function deleteversion {
  local l_VERSION=$1
  echo "Removing version ${l_VERSION}"
  rm ${SRC}/${APP}-${l_VERSION}
  exit
}

function listversions {
  ls ${SRC} | sed "s/${APP}-//g"
  exit 0
}

### # starting main
### check number of command line arguments
NUMARGS=$#
if [ $NUMARGS -eq 0 ]; then
  listversions
fi

### Start getopts code ###
#Parse command line flags
#If an option should be followed by an argument, it should be followed by a ":".
#The leading ":" suppresses error messages from
#getopts. This is required to get my unrecognized option code to work.
while getopts :idv: FLAG; do
  case $FLAG in
    i) # set option "i"
      INTERACTIVE=true
      ;;
    d) # set option "d"
      DELETE=true
      ;;
    v) # set option "v"
      VERSION=$OPTARG
      ;;
    *) # invalid command line arguments
      usage "Invalid command line argument $OPTARG"
      ;;
  esac
done


# user requested and interactive delete
if [[ "${INTERACTIVE}" == "true" && "${DELETE}" == "true" ]]
then
  select TargetVersion in $(ls ${SRC} | sed "s/${APP}-//g")
  do
    deleteversion ${TargetVersion}
  done
fi

# Given 1 parameter set to -i, destroy any existing symlinks and create one for the given version
if [[  "${INTERACTIVE}" == "true" ]]
then
  select TargetVersion in $(ls ${SRC} | sed "s/${APP}-//g")
  do
    switchversion ${TargetVersion}
  done
fi

# Given 1 parameter, destroy any existing symlinks and create one for the given version
if [[ "${DELETE}" == "true" ]]
then
  if [[ -f ${SRC}/${APP}-${VERSION} ]]
  then
    deleteversion ${VERSION}
  else
    echo "Version not found."
    exit 1
  fi
fi

if [[ -f ${SRC}/${APP}-${VERSION} ]]
then
  switchversion ${VERSION}
else
  echo "Version not found."
  exit 1
fi